Detection of the answering tone for modems and fax machines

Details Detection of the answering tone for modems and fax machines Detection of the answering tone for modems and fax machines

H - Electricity

04

M

H04M 11/06 (2006.01) H04B 3/20 (2006.01)

Patent

CA 2255169

A method for controlling an echo suppressor with echo control function, able to be switched on or off, in a telecommunication system, preferably a DECT system, whereby an answering tone is detected in transmitting and/or receiving direction and when the answering tone, in particular a 2,100 Hz signal typical for modem / fax connections is recognized, the echo control function is switched off, is characterized in that for recognition of the answering tone, a discrete Fourier transform (DFT) is used which preferably comprises a Goertzel algorithm. The presence of a non-speech connection can thereby be recognized particularly quickly and reliably and the echo control function can immediately be switched off.

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